Rural intersection: create curb return regions

Total video time: 9:09

Last updated: 2025-10-17

Exercise files: rurl-int-cr-rgn-01-end-data-c3d16.zip

Start with: 12345678\Design\Corridors\Crdr-25-4thAve.dwg

rurl-int-cr-rgn-01.mp4 5:05

To finish of the corridor design we need to create the curb return fillet regions. these will be assemblies that move along the curb return baseline and shoot back towards the lane edge of 25 and the centerline of 4th Ave. We will use a no daylight assembly in the southern 2 quadrants. Later we will make daylight versions in the north quadrants.

  1. Corridor Properties > Parameters tab > Add Baseline
  2. Alignment > Int-25-4thAve-SE
  3. Profile > Int-25-4thAve-SE-CG-Prop

  4. Alternately you can select from screen

  5. Right click the Baseline > Add Region > Assembly > Curb Return Fillet

  6. Select the Beginning and the End of the curb return

  7. Set the frequencies to 2.50'

  8. Open the Target Mapping dialog box
  9. Target Lane Width to Lcl4thAve (the centerline of the side road)
  10. Target Lane Width a second time to 25-Left-ETW

Info: The 25-Left-ETW is not visible right now, it is masked out so you aren't able to select from the screen.

  1. Target Lane Profile to 25-Left-ETW > 25-Left-ETW-Crdr-25-Setup-ETW
  2. Target Lane Profile a second time to Lcl4thAve > Proposed Profile

  3. OK > OK > Rebuild Corridor

Tip: If the corridor doesn't match up perfectly you may have to manually add a frequency.

  1. Highlight the Corridor > Edit Frequency > Select the Region
  2. In the Frequency dialog box select the + and left click the point on the screen

  3. OK > the frequency is added

  4. Repeat the steps with the SE curb return
  5. Save for the next exercise

Exercise files: Continue with previous data set or start with: rurl-int-cr-rgn-01-end-data-c3d16.zip

Start with 12345678\Design\Corridors\Crdr-25-4thAve.dwg

rurl-int-cr-rgn-02.mp4 4:04

For the north two curb returns we will add a daylight

  1. Corridor Properties > Parameters tab > Add Baseline > Int-25-4thAve-NE-CG
  2. Horizontal Alignment > Int-25-4thAve-NE-CG
  3. Right click the Baseline > Add Region > Assembly > Curb Return Fillet Daylight
  4. Select the beginning and end of curb return
  5. Set frequencies to 2.50'
  6. Target Lane Width to Lcl4thAve (the centerline of the side road)
  7. Target Lane Width a second time to 25-Right-ETW
  8. Target Lane Profile to 25-Right-ETW > 25-Right-ETW-Crdr-25-Setup-ETW
  9. Target Lane Profile a second time to Lcl4thAve > Proposed Profile
  10. OK > OK > Rebuild Corridor

  11. Repeat for the NE curb return